Who Would Win?

Unknown

Criminal mastermind, Clown Prince of Crime

Agility, Stamina, Intellect, Healing, Weapon Master, Chameleon, Insanely Rich, Unarmed Combat, Gadgets, Escape Artist, Adaptive, Enhance Mutation, Marksmanship, Stealth, Leadership

Joker venom, acid-squirting flower, razor-edged playing cards, joy buzzer, crowbar

Arkham Asylum Inmates, Black Glove, Club of Villains, Dark Judges, Grissom Syndicate, Injustice Gang, Injustice League, Joker Inc., Jokerz, Justice League of America, Justice League of Arkham, Legion of Doom, Red Hood Gang, Silicon Syndicate, The Joker League of Anarchy

Mera

Former queen of Atlantis; Former queen of Dimension Aqua

Hydrokinesis, Hard Water Constructs, Superhuman Strength, Underwater Breathing, Enhanced Durability, Aquatic Telepathy

Atlantean Armor, Trident (occasionally)

Aquaman Family; formerly Red Lantern Corps